A donut chart visualizes 2022 US auto sales by brand, displaying each brand's market share as a proportional arc with a color-coded legend. The chart shows sales percentages and raw numbers (in thousands) next to each brand name using D3's `pie`, `arc`, and `scaleOrdinal` APIs. Data is loaded asynchronously from a CSV via `d3.csv`, with the total sales calculated to compute percentages for display.